Cousin of OSW (Open Sim Wheel)

Thats right. How much torque you get will depend on the motor and the current you can supply it.

Okay I got it now I understand now thank you

Could you please post a pic of the stm32 and the programmer as I have never seen one before that would help me out a lot thank you

Of course - That means up until the motor melts:
If it's a 350w motor running at 24v, Max load is theoretically about 15A
Run it at 12v and that goes to ~30A but it can't sustain that for very long at all before it fuses the windings and/or melts the enamel causing a short.

Basically, you want to keep the power somewhere around what the motor would normally give off as heat at max load. That would be around 20-30% so about 10A (Sustained) - You might get away with one IBT-2 at that.

BUT - You can only limit that with the max power setting in the EMC software, there is not really a way to limit it electrically.

The occasional peak at 30A is still fine (say for example pushing past 'wheel lock') but you don't want to keep it there. This is configurable in software too.

Remember - We're operating in stall mode so almost ALL of the energy consumed is going to be given off as heat and not rotational movement like the motor is designed for.

I linked the programmer in my post - You are looking for an ST-Link v2. They are only a couple of dollars. You can use a serial programmer but the software to program it with is an absolute pain (will take multiple tries to get it to work and it's slow).

Hi, i want to build 1020 OSW and i found this https://www.alibaba.com/product-detail/YL1020ZX-MY1020ZXF-500W-36V-24V-Cheap_60589318971.html . I have access to 24v 500w 1020 with gear and i want to ask if it's worth to go this way ? or should i just buy 1020 without gears and go with higher ampere. It has 6:1 so with 24v i should get about 9nm of torque on 27A

If you add a gearbox it will no longer be a DD wheel

It's totally up to you but it all depends on how much resistance the gears are going to create. If there is too much then it will feel mushy and awkward. Gearing might be ok but I think you would regret using that motor if you felt a DD.

Where will you connect encoder? You might be able to use a lower pulse encoder on the back of the motor still I guess but a 1000ppr encoder works on both A/B and rising/falling edge so upscales to 4000ppr. 24000 ppr at 6:1... That's a lot.

Hi! First of all, thank you very much for sharing these information with us. I learned a lot reading through all these comments.
I am planning to build my first sim wheel set, but I just cannot figure out how to attach the steering wheel to the motor shaft. Can someone please point me at the right direction please? Thank you very much.

There is plenty of info here. I also have a build log for mine and I have shared files for 3d printing an adapter.
https://www.thingiverse.com/thing:3208235

The important part is to NOT rely on the little gear on the shaft to hold the wheel - It is generally loose and it will 'clunk' from side to side against the FFB. That's why I introduced two grub screws into the side of the shaft that go where you would normally put a spanner for removing the shaft nut.

My design does not need the shaft nut done up too tight as it's not the primary means of securing it like you might expect.

Hi!
I use STM32(EMC) for the motor and the encoder, for the buttons on the wheel I will use Arduino.
my question is, can I use 2 different "joysticks" in games?
thanks

I do in iracing (I have 3), however if you're using emc, why not use wireless buttons option?

yes I use 2 different usb devices for my OSW wheel - you need to write the code so it uses joystick1, joystick2, joystick3 etc

the other option for games that might not support more than one is to use joy2k, it will map joystick buttons to (any) keyboard presses. I use this for shift up/down between my wheel and side shifter. Both do the same function which is not something you can do by default in iracing.

what do you mean by "you need to write the code...", each board has its own code. do I miss something?

I asked the developer of the EMC about supporting rotary encoders and he said that the option is available only on the wireless buttons option. I will think about that although my wheel has a screen(simhub) so the wheel won't be wireless anyway I guess.

nice solution

Hello,
Seems like this thread is somewhat active, so I'll try asking here.
I'm making my own ffb wheel and have Arduino leonardo wired up correctly for RFR wheel config
Unfortunately, the motor is unresponsive when using iRacing wheel check

Has anybody had this issue before?

Use mmos

Doesn't mmos only work with stm32?

No, Don't, it's crap but yes, it's STM32 Only.

I have tried all of them on both platforms - Hands down and MILES ahead is the current EMC firmware on STM32 by Ebolz Magy. Don't waste your time on Arduino crap, it's outdated, slow and just not worth the effort of banging your head on the wall with unsupported/abandoned software. Spend the extra few $ on an STM32F407 board and the EMC firmware and have great support, more features and a 100% better wheel.